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TC1720
RS-422/RS-449 Async/Sync
FIBER OPTIC MODEM
(with Optional Dual Optics)
User's Manual
MODEL:
S/N:
DATE:
Although every effort has been made to insure that this manual is current
and accurate as of date of publication, no guarantee is given or implied
that this document is error free or accurate with regard to any specifica-
tion. TC Communications, Inc. reserves the right to change or modify
the contents of this manual at any time without prior notification.
©
COPYRIGHT 1992-2009. ALL RIGHTS RESERVED.
TC Communications, Inc. 17881 Cartwright Road, Irvine, CA 92614
Tel: (949) 852-1972
Fax: (949) 852-1948
Notice!
Web Site: www.tccomm.com
Email: info@tccomm.com
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Table of Contents
Related Manuals for TC Communications TC1720
Summary of Contents for TC Communications TC1720
- Page 1 TC Communications, Inc. reserves the right to change or modify the contents of this manual at any time without prior notification.
-
Page 2: Table Of Contents
TC1720 (Optional Dual Optics) Table of Contents User's Manual Rev. 1.4 Chapter 1 - Overview ....................3 Description ............................3 Electrical Specifications ........................3 Virtual Pin Assignments and Theory of Operation ............... 3 LEDs, DIP Switches and Connectors ....................4 DIP Switch Functions ........................ -
Page 3: Chapter 1 - Overview
It is available in either rack mount or stand alone versions; the rack mount version can be converted to the stand alone version with the addition of a sheet metal box. The TC1720 can communicate at distances up to 4 km using Multimode optics and up to 80 km using Single Mode optics. Fiber optic connectors can be either ST or FC type. -
Page 4: Leds, Dip Switches And Connectors
- DCE when it is “on” (down position), it turns “on” the Slave-clock mode: (RT=ST). when it is “off” (up position), it turns “on” the Internal clock mode: (ST=Internal clock) see table 1. Internal clock Pins: “off” (up position) Function of SW3 “On” (down position) Slave clock Figure 3. TC1720's Front Panel... -
Page 5: Dip Switch Functions
Async/Sync. Configure unit as Async or Sync. On: Async Off: Sync Note: DIP Switches SW1-5 through SW1-8 are used for the internal clock generator. If the internal clock from the TC1720 will be utilized, a clock rate can be selected according to the following table. For Oscillator: 8.192Mhz... -
Page 6: Rs-422/449 Termination Resistor
The termination resistors are 100 to 130 ohm resistors located inside the TC1720. Two jumpers, identified as board locations “JP2” & “JP3,” control the termination resistance on each unit. “JP3” controls the resistance for the unit’s receiver, while “JP2”... -
Page 7: Optical Redundancy (Optional)
The power plug can be connected into either power jack on the rear panel. Because the TC1720 is equipped with a built-in power redundancy feature, the "POWER A" or "POWER B" LEDs on the front panel will illuminate according to which power source the unit is drawing from. -
Page 8: Chapter 2 - Installation
Inc. Equipment Location The TC1720 should be located in an area that provides adequate light, work space, and ventilation. Avoid locating it next to any equipment that may produce electrical interference or strong magnetic fields, such as elevator shafts, heavy duty power supplies, etc. As with any electronic equipment, keep the unit from excessive moisture, heat, vibration, metallic particles and freezing temperatures. -
Page 9: Typical Point To Point Application Diagram
TC1720 (Optional Dual Optics) User's Manual Rev. 1.4 RS 422/449 F/O RS 422/449 F/O OPTIC OPTIC MODEM MODEM OPTIC OPTIC DEVICE 422/ 422/ DEVICE 422/ 422/ OPTIC OPTIC OPTIC OPTIC (Dual Optic Models only) Figure 5. Typical Point-to-Point RS-442/449 Application Diagram After installation is complete, it is an excellent idea to verify and record the optical cable loss. -
Page 10: Chapter 3 - Troubleshooting
1. Make sure the electrical signal connections match the pin assignments for the device (refer to page 3 for DCE/DTE pin connections). Verify signal connections by checking the status LEDs on the front panel of the TC1720. Verify that the pin signal connections match the appropriate LED responses (see Figures 1, 2 & 3). -
Page 11: Optic Cable Verification
TC1720 (Optional Dual Optics) User's Manual Rev. 1.4 Optic Cable Verification If the "Rx-A" LED on the front panel is flashing (or off), this is an indication that the optic signal is not being correctly received. Usually, unsecured fiber optic connectors or faulty cable are to blame. A good connection is indicated by the "Rx-A"... -
Page 12: Chapter 4 - Bench Tests
5. The "Vcc" LED should be illuminated. Please note: all other LEDs can be in a random state (flashing, solidly lit, or off) as only upon proper receipt and transmission of a signal will the TC1720 set its LEDs appropriately for normal operation. -
Page 13: Local Electrical Loopback Test
5. The data bits should be selected as ‘8 bits’ and the data pattern should be set to ‘2047’ on the BERT tester. 6. At this point, the following LEDs should be observed on the TC1720 unit: The "TxD," "TxClk," "PWRA or PWRB," "Vcc," and "ALARM" should be solidly lit. Note, the "ALM" LED will be solidly lit and the "RxA"... -
Page 14: Local Optical Loopback Test
7. Verify that the "TxD," "RxD," "TxClk," "RxClk," "RxA," "PWRA or PWRB," and "Vcc" LEDs are solidly lit on the TC1720. Note, the "ALARM" LED will be "Off" since there is optical fiber cable(s) connected. All other LEDs should be off. -
Page 15: Remote Optical Loopback Test
Remote Optical Loopback Test Rev. 1.4 1. Connect a second TC1720 unit. As with the first unit, from doing the local optical loopback test, follow the bench test steps on the previous page. When you have completed the local optical loopback test for the second unit, proceed to the next step. -
Page 16: Remote Electrical Loopback Test
Local & Remote TC1720's are to the up "Off" position. 2. Connect four copper-wire jumpers to short (loopback) the DB37 Male connector on the rear of the remote unit as follows (these copper-wire connections will loopback the signal at the remote TC1720): Pin 4 (+SD) to Pin 6 (+RD) -
Page 17: Bench Test With Built-In Signal Generator
Before proceeding with the Signal Generator test, please read the Warranty Note on page 10. 1. Setup the bench test as shown in Figure 10. 2. At the local TC1720 unit, turn on the "SIG-GEN" by sliding SW1-1 (switch 1 of the "SW1 Internal DIP Switch") to the right (on) position. -
Page 18: Chapter 5 - Component Placement
SW1-4: enable Async/Sync mode For Oscillator: 8.192Mhz 10 11 12 SW1-5: SW1-6: SW1-7: SW1-8: 5 - 10M 4.096M 9.6k 19.2k 32k 38.4k 256k 512K 1.024M 2.048M 128k Figure 11. Component Locations on TC1720's Internal PCB (with optional Dual Optics) -18-... -
Page 19: Chapter 6 - Specifications
TC1720 (Optional Dual Optics) Chapter 6 - Specifications User's Manual Rev. 1.4 Data Rates Asynchronous ..................Up to 10 Mbps Synchronous ..................... Up to 5 Mbps Optical Transmitter ................... LED/LASER with AGC Receiver ......................Pin Diode Wavelength ..................1310nm Multimode .................... -
Page 20: Return Policy
Buyer should notify TC Communications, Inc. promptly in writing of any claim based upon warranty, and TC Communications, Inc., at its option, may first inspect such goods at the premises of the Buyer, or may give written authorization to Buyer to return the goods to TC Communications, Inc., transportation charges prepaid, for examination by TC Communications, Inc.
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